COLLECTED Ilf BATCHIAN, KATSA.A, ETC. 281 



Gen. AsiLUS, Linn. 



39, AsiLUS INVOLUTUS, u. s. Fcem. Niger, auratiis, barba aurata, 

 mystace iiii^ro setis noniiuUis anticis albis, thorace vittis quatuor nigris 

 abdomine fasciis nigvis latis subtrigouis aiilcein versus stylato, pedibiis 

 rufis, feraoribus nigro vlttatis, alls cinereis apuil costain nigricantibas. 



Allied to A. determinatus and to A. introducens. 



Female. Black, brightly gilded. Mystax composed of several black 

 bristles and of some lower white bristles; beard with gilded hairs. 

 Palpi beset with black hairs and bristles. Third joint of the antennae 

 lanceolate, shorter than the 1st and 2nd joints together; arista much 

 longer than the .Srd joint. Thorax with four black stripes ; the lateral 

 pair abbreviated and dilated. Abdomen with a broad nearly triangulai* 

 black band on each segment, excep ting the apical part, which is sty- 

 late, compressed, and much more than one-third of the whole length. 

 Legs red, very robust; stripes of the femora, knees, and tai'si, except 

 the tips, black. V>^ings cinereous, blackish along the costa and to- 

 wards the tips; hind branch of the radial vein undulating; halteres 

 luteous. Length of the body 9 lines ; of the wings 14 lines. 



40. AsiLus coMPLENS, U.S. F(Em. Niger, capite antico albido sub- 

 aurato, epistomate convexo, mystace setis albis nonnullisque nigris, 

 antennis brevissimis, thoracis lateribus vittisque tribus cinereis, ab- 

 domine lanceolate fasciis cinereis, alis cinereis apice nigricantibus, 

 halteribus flavescentibus. 



Female. Black. Head behind, pectus, and sides of the thorax cinereous ; 

 front of the head whitish, slightly gilded ; epistoma pi'ominent ; mys- 

 tax composed of white and of fewer black bristles. Antennae very 

 short; 3rd joint shorter than the first, and about one-thii-d of the 

 length of the arista. Thorax with three cinereous stripes. Abdomen 

 lanceolate, not stylate, v>'ith a slender cinereous band on the hind 

 border of each segment. Legs not very robust, with a few black 

 hairs and spines. Wings cinei-eous, blackish towards the tips ; veins 

 black ; hind branch of the cubital vein undulating ; halteres yellowish. 

 Length of the body 7 lines; of the wings 12 lines. 



Greu. Ommatius, Illlger. 



41. Ommatius noctifer. Walk. See Vol. IL p. 88. 



Gren. LEPToaASTEB, Meigen. 



42. Leptogaster ferrugineus. Walk. See Vol. III. p. 89. 



43. Leptogaster tarsalis, n. s. Niger, capite pectore thoracisque 

 lateribus albo tomentosis, pedibus piceis, trochantcribus posticis albi- 

 dis longissimis, femoribiis subtus flavescentibus, tibiis posticis tarsis- 

 que basi albidis, alis subcinereis, halteribus albidis. 



Black. Head, pectus, and sides of the thorax with white tomentura. 

 Legs piceous ; hind trochanters whitish, very much elongated ; femora 

 IIXN. PKOC. — ZOOLOGY. 19 



